Elizabeth Holmes “was in charge” at Theranos, Mattis tells court

Elizabeth Holmes speaking at the Fortune Global Forum in 2015, around the time Theranos was under increasing pressure to deliver results from its ill-fated Edison testing device. (credit: Fortune Global Forum / Flickr)

James Mattis, the retired general and former defense secretary, took the stand yesterday in the criminal trial of Elizabeth Holmes, detailing how his faith in the company plummeted when a Wall Street Journal expose revealed that Theranos had been performing tests on third-party equipment.

There just came a point where I didn't know what to believe about Theranos anymore," he said.

When Mattis first met Holmes in 2011 in San Francisco, he was taken by her vision and believed it could become a critical tool for the military. Later, she gave him a private demonstration, pricking his finger and showing him the company's Edison device.

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